Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
  • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
  • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
  • B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
  • B21B2003/005—Copper or its alloys
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills

Definitions

• Our invention relates to the processing of soft metals, and more particularly, to a method of rolling copper and copper alloys such as brass from a slab to a product of strip thickness.
• Our method of processing of soft metal slabs to strip thicknesses comprises providing a hot reversing mill having coiler furnaces on either side thereof along the processing line, heating a slab to hot working temperature and passing the heated slab back and forth through the hot reversing mill and then coiling it in the coiler furnaces when it has reached a thickness capable of being coiled. Thereafter, the product, which has been reduced to strip thickness, is quenched and descaled without the need for milling, cold reduction or annealing.
• FIG. 1 is a schematic of the conventional prior art hot processing line
• Fig. 2 is a schematic showing the improved processing of our invention
• Fig. 3 is a modified embodiment of our processing using coiling and decoiling subsequent to quenching; and Fig. 4 is a further modification of our processing which includes downstream vertical coiler furnaces.
• DESCRIPTION OF THE PREFERRED EMBODIMENTS Our invention is directed to the processing of soft metals such as copper, and copper alloys such as brass, from a slab to a product of strip thickness. Other brazing type silver alloys and alloys of lead and titanium or zirconium may be similarly processed.
• Slabs generally designated 10 are formed through conventional techniques such as direct chilling with a typical slab size being on the order of 6
• the cutting roll of each roll pair is on opposite sides of the intermediate product from the cutting roll of the other pair so as to mill both the top and bottom surface of the intermediate product which is flat passed through the overhauler 20. At least .01 inches is taken off each side of the intermediate product.
• the typical line speed for such an overhauling operation is on the order of 40 feet per minute. These slow speeds create a production bottleneck.
• the intermediate product is then cold reduced on a two-stand tandem mill generally designated 26 into coil form or on a single stand mill which may or may not be of the reversing type.
• the thickness of the intermediate product is reduced to a strip thickness on the order of 0.10 inches or less in a series of passes. Because the product has now been cold worked, it is subsequently sent through an annealing furnace 28. A typical anneal for brass is on the order of 950°F for 360 minutes.
• the annealed coils are then finished on a chemical treat or pickling line 30, and finally, the strip thickness product is buffed or scalped by the appropriate work station 32 upon leaving the pickling tank 30.
• the direct chilled or otherwise formed slabs 10 may be initially passed through an optional slab milling station 38.
• the slab is then heated in a reheat furnace 12' prior to hot reduction.
• the hot reduction takes place on an in-line hot reversing mill 40 having an upstream coiler furnace 42 and a downstream coiler furnace 44.
• the slab is passed back and forth through the hot reversing mill 40 for 9 passes until it reaches a thickness capable of being coiled (less than one inch thickness) and thereafter the product is passed back and forth (passes 10 through 17) through the hot reversing mill 40 between the coiler furnaces 42 and 44.
• a thickness capable of being coiled less than one inch thickness
• the slab is reduced all the way down to a strip thickness of .118 inches in the example of Table 1 or less. Because the product is coiled in a coiler furnace where reducing gases are formed and an oxygen lean environment exists, the coil is not exposed for prolonged periods to an oxygen bearing environment which allows for selective evaporation of one of the alloy components to form a depleted surface thickness or for internal oxidation as oxygen diffuses into the subsurface.
• the rolled product would be coiled in the upstream coiler furnace 42 on the penultimate pass and on the final pass through the mill at a temperature of 805 F would pass directly into the quenching operation 16 / .
• the coiled length is on the order of 729 feet. Because the thickness is now at strip thickness, quenching is substantially quicker because of the greater heat loss from the thinner section.
• the strip is quenched to ambient temperature.
• the strip can then pass directly into the chemical pickle tank 30' and through the final buffing and/or scalping station 32'.
• a pair of bridle rolls 45 at the entry end of the pickling tank 30' maintain the necessary tension on the strip thickness product so that it can be effectively carried through the pickling and buffing or scalping operations. It is envisioned that all of the processing steps are carried out in-line and that there is no need for crossover tables and the like.
• the maximum flat rolled length is about 94 feet.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Metal Rolling (AREA)
• Forging (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=24837066

Family Applications (1)

Country Status (9)

Cited By (6)

Families Citing this family (10)

Citations (6)

Family Cites Families (7)

• 1991
  • 1991-05-28 US US07/706,318 patent/US5140837A/en not_active Expired - Fee Related
• 1992
  • 1992-05-28 KR KR1019930700244A patent/KR960003707B1/ko not_active IP Right Cessation
  • 1992-05-28 JP JP5500592A patent/JPH0741286B2/ja not_active Expired - Lifetime
  • 1992-05-28 EP EP92913339A patent/EP0541781B1/de not_active Expired - Lifetime
  • 1992-05-28 CA CA002087860A patent/CA2087860C/en not_active Expired - Fee Related
  • 1992-05-28 DE DE69222504T patent/DE69222504T2/de not_active Expired - Fee Related
  • 1992-05-28 AT AT92913339T patent/ATE158728T1/de not_active IP Right Cessation
  • 1992-05-28 WO PCT/US1992/004554 patent/WO1992021454A1/en active IP Right Grant
• 1997
  • 1997-11-19 GR GR970403071T patent/GR3025426T3/el unknown

Patent Citations (6)

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